department of energy. >> thanks, jane. this report on home heating from the department of energy says that the average american home may be getting only half the heat you're paying for. now we're going to put the department of energy document number up on the screen so you folks at home can look it up online. but i'm quoting from the report now. and then it goes on to conclude that... >> jane: wow, richard, if that's the bad news, what's the good news? >> well, the good news is i'm here with a very special guest who is a certified home energy rater, meaning he's an expert in home heating efficiency. karl, thank you for joining us. >> my pleasure, richard. >> now, karl, i had a lot of fun playing a home improvement expert on tv, but you're the real deal. we've been trying to make sense of this report from the u.s. department of energy that says half of what people are spending on their home heating could be wasted. can you explain to us what this means? >> sure. the typical home has a furnace with forced-air system. heated